thanks, i figured the hole was tdc, but wanted to confirm, this is what i am up against, after a little web surfing, i have seen a few timing tabs, mine looks nothing like some of the others, ie, easier to read. How do you get a timing light to see down here, first pic you can just see the damper slit, second you can just see the tab, and thoat is only because i have my hand down in the fan at the level of the tab, no way i can get down there with the engine runnin!! John